/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.linkis.manager.label.builder;

import org.apache.linkis.manager.label.entity.GenericLabel;
import org.apache.linkis.manager.label.entity.Label;
import org.apache.linkis.manager.label.exception.LabelErrorException;

import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;

/** Use to build subLabels of generic label */
public class GenericLabelBuilder extends DefaultGlobalLabelBuilder {
    @Override
    public boolean canBuild(String labelKey, Class<?> labelClass) {
        return null != labelClass && GenericLabel.class.isAssignableFrom(labelClass);
    }

    @Override
    @SuppressWarnings(value = {"unchecked", "rawtypes"})
    public <T extends Label<?>> T build(
            String labelKey, Object valueObj, Class<?> labelClass, Type... valueTypes)
            throws LabelErrorException {
        Class<? extends Label> suitableLabelClass = getSuitableLabelClass(labelKey, labelClass);
        if (null != suitableLabelClass) {
            Type suitableValueType = getSuitableValueType(suitableLabelClass, valueTypes);
            if (null != suitableValueType) {
                if (null != valueObj && List.class.isAssignableFrom(valueObj.getClass())) {
                    List<?> rawList = (List<?>) valueObj;
                    if (!rawList.isEmpty()
                            && Label.class.isAssignableFrom(rawList.get(0).getClass())) {
                        List<GenericLabel> genericLabels = new ArrayList<>();
                        for (Object rawObj : rawList) {
                            genericLabels.add(
                                    buildInner(
                                            labelKey,
                                            ((Label<?>) rawObj).getValue(),
                                            suitableLabelClass,
                                            suitableValueType));
                        }
                        return (T)
                                genericLabels.stream()
                                        .filter(
                                                (label) ->
                                                        label != null && label.getValue() != null)
                                        .reduce(
                                                (leftLabel, rightLabel) -> {
                                                    leftLabel
                                                            .getValue()
                                                            .putAll(rightLabel.getValue());
                                                    return leftLabel;
                                                })
                                        .orElse(null);
                    }
                }
                return super.buildInner(labelKey, valueObj, suitableLabelClass, suitableValueType);
            }
        }
        return null;
    }
}
